code: def show(block=None):
      """
      For image backends - is not required
      For GUI backends - show() is usually the last line of a pylab script and
      tells the backend that it is time to draw.  In interactive mode, this may
      be a do nothing func.  See the GTK backend for an example of how to handle
      interactive versus batch mode
      """
      for manager in Gcf.get_all_fig_managers():
          # do something to display the GUI
          pass
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  from matplotlib._pylab_helpers import Gcf
  from matplotlib.backend_bases import FigureCanvasBase, FigureManagerBase, GraphicsContextBase, RendererBase
  from matplotlib.figure import Figure
label_desc: Use image node_id 2 for calling a global function with example usage: show(block) without return types